Abstract
Cla.vi.chla.my'di.a. L. n.
clava
a knotty branch, rough stick, cudgel, club; N.L. fem. n.
Chlamydia
taxonomic name of a bacterial genus; N.L. fem. n.
Clavichlamydia
a club
Chlamydia
(the morphology of the bacteria includes the characteristic head‐and‐tail cells that have been described earlier from salmonid fish suffering from epitheliocystis).
Pleomorphic or elongated
,
nonmotile
,
obligate intracellular bacteria
,
up to 2
μ
m in length
. Cells show a
developmental cycle
with morphologically distinct stages and thrive
inside a host vacuole
. Organisms were found within gill lesions of fish and are differentiated from all other chlamydiae by the morphology of the proposed
elementary bodies
,
which show a characteristic head‐and‐tail form
(Figure 1). Members have not yet been obtained in cell culture.
Type species
: “
Candidatus
Clavichlamydia salmonicola
” corrig. Karlsen, Nylund, Watanabe, Helvik, Nylund and Plarre 2008.
Taxonomic and Nomenclature Notes
According to the List of Prokaryotic names with Standing in Nomenclature (LPSN), the taxonomic status of the genus
Candidatus Clavichlamydia
is: preferred name (not correct name) (last update, February 2025)
*
.
LPSN classification:
Bacteria
/
Pseudomonadati
/
Chlamydiota
/
Chlamydiia
/
Chlamydiales
/
Chlamydiaceae
/
Candidatus Clavichlamydia
The genus
Candidatus Clavichlamydia
can also be recovered in the Genome Taxonomy Database (GTDB) as
g__Clavichlamydia
(version v220)
**
.
GTDB classification:
d__Bacteria
/
p__Chlamydiota
/
c__Chlamydiia
/
o__Chlamydiales
/
f__Chlamydiaceae
/
g__Clavichlamydia
*
Meier‐Kolthoff
et al. (
2022
).
Nucleic Acids Res
,
50
,
D801
–
D807
; DOI:
10.1093/nar/gkab902
**
Parks
et al. (
2022
).
Nucleic Acids Res
,
50
,
D785
–
D794
; DOI:
10.1093/nar/gkab776